Portable heat welding machine



FIG. 1 is a perspective view of a first embodiment of the portable heat welding machine of the present invention.

FIG. 2 is a front elevational view of the first embodiment.

FIG. 3 is a rear elevational view of the first embodiment.

FIG. 4 is a top plan view of the first embodiment.

FIG. 5 is a bottom plan view of the first embodiment.

FIG. 6 is a left end elevational view of the first embodiment; and,

FIG. 7 is a right end elevational view of the first embodiment. 

The ornamental design for a portable heat welding machine, as shown and described. 